Added example app to receive timed samples.

Added useful calls to simple device.
Fixed vrt frac time usage (wrong word).

2 files changed, 94 insertions, 0 deletions

diff --git a/host/apps/CMakeLists.txt b/host/apps/CMakeLists.txt
index 4deb41965..f31206e1a 100644
--- a/host/apps/CMakeLists.txt
+++ b/host/apps/CMakeLists.txt
@@ -21,3 +21,6 @@ INSTALL(TARGETS discover_usrps RUNTIME DESTINATION ${RUNTIME_DIR})
 
 ADD_EXECUTABLE(usrp2_burner usrp2_burner.cpp)
 TARGET_LINK_LIBRARIES(usrp2_burner uhd)
+
+ADD_EXECUTABLE(uhd_rx_timed_samples uhd_rx_timed_samples.cpp)
+TARGET_LINK_LIBRARIES(uhd_rx_timed_samples uhd)
diff --git a/host/apps/uhd_rx_timed_samples.cpp b/host/apps/uhd_rx_timed_samples.cpp
new file mode 100644
index 000000000..97f75647e
--- /dev/null
+++ b/host/apps/uhd_rx_timed_samples.cpp
@@ -0,0 +1,91 @@
+//
+// Copyright 2010 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#include <uhd/simple_device.hpp>
+#include <uhd/props.hpp>
+#include <boost/program_options.hpp>
+#include <boost/format.hpp>
+#include <iostream>
+#include <complex>
+
+namespace po = boost::program_options;
+
+int main(int argc, char *argv[]){
+    //variables to be set by po
+    std::string transport_args;
+    int seconds_in_future;
+    size_t total_num_samps;
+
+    //setup the program options
+    po::options_description desc("Allowed options");
+    desc.add_options()
+        ("help", "help message")
+        ("args", po::value<std::string>(&transport_args)->default_value(""), "simple uhd transport args")
+        ("secs", po::value<int>(&seconds_in_future)->default_value(3), "number of seconds in the future to receive")
+        ("nsamps", po::value<size_t>(&total_num_samps)->default_value(1000), "total number of samples to receive")
+    ;
+    po::variables_map vm;
+    po::store(po::parse_command_line(argc, argv, desc), vm);
+    po::notify(vm); 
+
+    //print the help message
+    if (vm.count("help")){
+        std::cout << boost::format("UHD RX Timed Samples %s") % desc << std::endl;
+        return ~0;
+    }
+
+    //create a usrp device
+    std::cout << std::endl;
+    std::cout << boost::format("Creating the usrp device with: %s...")
+        % transport_args << std::endl;
+    uhd::simple_device::sptr sdev = uhd::simple_device::make(transport_args);
+    uhd::device::sptr dev = sdev->get_device();
+    std::cout << boost::format("Using Device: %s") % sdev->get_name() << std::endl;
+
+    //set properties on the device
+    double rx_rate = sdev->get_rx_rates()[4]; //pick some rate
+    std::cout << boost::format("Setting RX Rate: %f Msps...") % (rx_rate/1e6) << std::endl;
+    sdev->set_rx_rate(rx_rate);
+    std::cout << boost::format("Setting device timestamp to 0...") << std::endl;
+    sdev->set_time_now(uhd::time_spec_t(0));
+
+    //setup streaming
+    std::cout << std::endl;
+    std::cout << boost::format("Begin streaming %u seconds in the future...")
+        % seconds_in_future << std::endl;
+    sdev->set_streaming_at(uhd::time_spec_t(seconds_in_future));
+
+    //loop until total number of samples reached
+    size_t num_acc_samps = 0; //number of accumulated samples
+    while(num_acc_samps < total_num_samps){
+        uhd::rx_metadata_t md;
+        std::complex<float> buff[1000];
+        size_t num_rx_samps = dev->recv(boost::asio::buffer(buff, sizeof(buff)), md, "32fc");
+        if (num_rx_samps == 0) continue; //wait for packets with contents
+
+        std::cout << boost::format("Got packet: %u samples, %u secs, %u ticks")
+            % num_rx_samps % md.time_spec.secs % md.time_spec.ticks << std::endl;
+
+        num_acc_samps += num_rx_samps;
+    }
+
+    //finished, stop streaming
+    sdev->set_streaming(false);
+    std::cout << std::endl << "Done!" << std::endl << std::endl;
+
+    return 0;
+}